Arc welding electrode



Dec. 8, 1936. w. B. MILLER 2,063,182

ARC WELDING ELECTRODE Filed April 15, 1933 INVENTOR MLBEA B. MILLER Patented Dec. 8, 1936 Wilber B. Miller, Flushing, N.

mesne ents,

Y., assignor, by to Union Carbide and Carbon Corporation, a corporation of New York Application April 15, 1933, Serial No. 668,235

7 Claims.

This invention relates to welding rods and especially to acoated welding rod suitable for use as an electrode in metallic arc welding. An object of this invention is to provide a welding rod having a coating including arc stabilizing material and especially a rod having a fabric in contact with the bare rod. A further object of the invention is to provide means whereby a thick coating is held in firm contact with the rod. These and other objects of the invention will be evident from the following specification having reference to the accompanying drawing, in which Fig. 1 is a view of a rod illustrating one embodiment of my invention.

Fig. 2 is a view of the which is adapted in the welding light structures.

Fig. 3 is a view of a modified form of rod which may be used as shown or which may be coated in the manner shown in Fig. 1; and

Fig. 4 is a section, on the line 4-4 of Fig. 1.

In the drawing reference numeral vIi designates the electrode core which is 'of metal and generally of ferrous metal; l2 designates a layer of cellulosic material which is described more in detail below: and i3 designates a layer of fiux or slag forming material.

In carrying out my invention the bare steel electrode I i is wrapped with a cellulosic material i2. I use a strip or tape of fabric. While I prefer woven cotton fabric, I may also use a felted cotton fabric or a linen fabric of vegetable material. The strip may be wound spirally about the partially completed rod form shown for use in rod as shown in Fig. 2 or applied longitudinally as shown in Fig. 3-. This strip may be first impregnated with the hinder or adhesive or the ends only of the fabric may be secured with adhesive and the coated or wrapped electrode then sprayed with or dipped in adhesive and baked. I prefer to use waterglass as an adhesive. Should it be desired to use the covered electrode without an additional coating, a'small amount of arc stabilizing substance, may be added to the adhesive, or very thin coatings such as are disclosed in Kiel]- berg Patent 1,115,317 may be used. However, for heavy welding operations the arc stabilizing material, together with other flux material, is formed in a slurry and applied outside the fabric by dipping or spraying. This outside cover may also be applied by extrusion. After the covering is in place the electrode is dried or baked.

In forming the outer covering of flux mixtures I have found the following compositions suitable:

5 Partsbyweight I II III IV V VI VII VIII Slip clay so so 15 40 4o 15 10 Iron xi 30 30 30 20 Calcium carbonate l0 13 60 20 20 a ferros 3 3 2 65 a high carbon ferroehroma 3 ,5 5 5 6-12 Manganese ore 5 5 5 5 Carbonaceous material 5 5 5 5 5 5 15 dspar 20 19 20 20 Rutile 5 10 10 10 I0 10 Silica 40 40 30 Faro-manganese-.- 8 8 8 0-15 The flux mixtures are mixed with diluted 20 waterglass to a consistency suitable for dipping. The mixture containing iron oxide gives better results with thick coatings than with thin coatings. The slip .clay is preferably of the type known as Albany slip clay and its composition is- 25 set forth in my copending application Serial No. 658,023, filed February 23, 1933. Using a rod, containing approximately 0.14% carbon and 0.50% manganese, coated with a strip of loosely woven muslin and dipped in fiux mixture I, I 30 have obtained welds having a strength of over 71,000 lbs. per square inch with good ductility.

I claim:

1. An electrode for arc welding comprising a ferrous core, a woven fabric of vegetable fibers 35 in direct contact with said core, and a coating consisting of slip clay, an alkaline earth carbonate, ferrochrome, carbonaceous material, rutile, silica and ferro-manganese.

2. A welding electrode comprising a ferrous 40 core having a layer of cellulosic material in contact with said core and flux material surrounding said cellulosic material, said flux material having the following approximate composition by weight: slip clay 50 parts, iron oxide 30 parts, 45 calcium carbonate 10 parts, ferrosilicon 3 parts, ferrochrome 3 parts, manganese ore 5 parts, carbonaceous material 5 parts, feldspar 20 parts.

3. An electrode for arc welding comprising a ferrous core, an unpurified cellulosic fabric 50 wrapping immediately surrounding said core and a, coating comprising slip clay, an alkaline'earth carbonate, ferro-silicon, term-chrome, a, manganese compound, rutile and carbonaceous material.

4. An electrode for arc welding comprising a ferrous core, an 1 unpurifled cellulosic fabric wrapping surrounding said core and in contact therewith, and a coating comprising calcium carbonate about 50 parts; carbonaceous material about 5 parts, rutile' about 10 parts and silica about 40 parts.

5. An electrode for arc welding comprising a ferrous core, an unpurified cellulosic fabric immediately surrounding said core and a coating consisting of slip clay, calcium carbonate, ferrochrome, carbonaceous material, rutile, silica and term-manganese.

ing of a mixture of arc stabilizing material and fluxing material of a difierent composition from the adhesive surrounding said fabric.

WILBER B. MILLER.

CERTIFICATE OF CORRECTION.

tent No. 2, 063,182.

December 8, 1936.

WILBE'R B. MILLER.

It is hereby certified that error appears in the printed specification of ie above numbered patent requiring correction as follows:

Page 1, first alumn, line 32-33, strike out the words "of vegetable material" and insert ae same after "fabric" and before the period in line 30;

atters Patent should be read with this correction therein that the same ay conform to the record of the case in the Patent Office. Signed and sealed this 16th day of February, A. D. 1937.

cal)

Henry Van Arsdale Acting Commissioner of Patents.

and that the said 

